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Evaluation of Thermal Conductivity of Porous TiO2-SiO2-Base Thermal Insulation

다공성 TiO2-SiO2 복합 단열재의 열전도율 평가

  • Choi, Byugchul (School of Mechanical Engineering, Chonnam National University) ;
  • Kim, Jon-Ho (School of Chemical Engineering, Chonnam National University) ;
  • Kim, Jon Beom (Photo & Environment Co.) ;
  • Jung, Woonam (School of Mechanical Engineering, Chonnam National University) ;
  • Lee, Sang-Hyun (Korea Research Institute of Standards and Science)
  • Received : 2018.09.05
  • Accepted : 2018.11.09
  • Published : 2018.11.30

Abstract

We developed nano-porous $TiO_2-SiO_2$ composites (commercial name : PTI, porous titania insulator) with low thermal conductivity as thermal insulating material as well as function of photocatalyst. The objectives of this paper are, firstly, to evaluate of the thermal conductivity of the PTI powder in the temperature range from -160 to $250^{\circ}C$, secondly to evaluate of thermal conductivities of insulation materials that is applied PTI powder. The structure of the PTI powder that has the pores size of 20-30 nm and the particle diameter of 2-10 nm. The PTI had a high surface area of $400m^2/g$ and a mean pore size of $45{\AA}$, which was fairly uniform. The thermal conductivity was measured by GHP(guarded hot plate) method and HFM(heat flux method). The PTI structure is a three-dimensional network nano-structures composed by a pearl-necklace that involved a precious stone in the center of the necklace. The thermal conductivities of PTI-PX powder by the GHP and HFM were 0.0366 W/m.K, 0.0314 W/m.K at $20^{\circ}C$, respectively. This is similar to values that are proportional to the square of the absolute temperature of the thermal conductivity of static air. The thermal conductivities of insulating sheets coated with PTI powder were similar results with that of the PTI powder.

Keywords

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